Firstly, spot testing the gum with your nail. It might increase the injury further. The description of your problem is not very clear but considering the burning sensation with mouthwash, it could be an ulcer. Stop using the mouthwash too. Visit a dentist at the earliest so that the exact problem is known. Avoid eating spicy foods.

Hello.. you cant basically mask the gum problems by the use of mouth washes and ointments. you need a professional cleaning and root planing and if necessary, flap surgery with or without bone grafting depending on your opg x -ray observation. dont delay anymore, health is more important than any other thing

May be there is an ulcerative lesion, or your gums may be affected with pyorrhoea.